QA79

ICD-11 MMS 2026-01

Drug or substance interactions without injury or harm

Description

A drug interaction is a situation in which a substance affects the activity of another drug when both are administered together. Includes increased effectiveness, decreased effectiveness or a new effect that is not produced from either drug on its own. No injury or harm occurred as a result.

Index terms

  • Drug or substance interactions without injury or harm
  • drug-drug interaction
  • drug-food interaction
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  • prescription and non-prescription interaction

Excludes

  • PL13.9 – Drug or substance interactions, as mode of injury or harm

Exclusions from above levels

  • PL13 – Mode of injury or harm associated with exposure to a drug, medicament or biological substance
  • QA8B – Delayed treatment without injury or harm

Sibling codes

  • QA70 – Overdose of substance without injury or harm
  • QA71 – Underdosing without injury or harm
  • QA72 – Incorrect substance without injury or harm
  • QA73 – Incorrect route of administration without injury or harm
  • QA75 – Incorrect duration of administration or course of therapy without injury or harm
  • QA76 – Medication or substance that is known to be an allergen without injury or harm
  • QA77 – Medication or substance that is known to be contraindicated for the patient without injury or harm
  • QA78 – Expired or deteriorated medication or substance without injury or harm
  • QA7A – Inappropriate stoppage or discontinuation of drug without injury or harm
  • QA7Y – Other specified circumstances associated with exposure to a drug, medicament or biological substance influencing the episode of care without injury or harm
  • QA7Z – Circumstances associated with exposure to a drug, medicament or biological substance influencing the episode of care without injury or harm, unspecified

Foundation entity

Drug or substance interactions without injury or harm – http://id.who.int/icd/entity/854464302

Part of: 24: Factors influencing health status or contact with health services